Hi. I have Dell e6430 laptop and i've been using it with external graphics card connected via ExpressCard slot. By default in BIOS (efi variables) setting primary display (variable 0x1D4) is set to auto (value 0x0) and setting internal graphics (variable 0x1D8) is set also set to auto (0x01). Being stupid enough not to carefully think before playing with efi variables I set primary display to PCI bus (0x02) and internal graphics to disabled (0x0).

(I had problems connecting egpu via EC-slot set into gen2 mode (gen1 works perfectly) - the laptop just didn't want to use the egpu, so I figured I can "force" it to use egpu by playing with efi variables. Don't even say, now I know how stupid it was:)

Long story short, now I can't even boot my laptop because the internal graphics is disabled and egpu also won't work because EC is working on gen2 mode.

The question is: have I "bricked" my laptop, or is there a way for hardware reset of BIOS settings? (I've tried pulling out batteries - it didn't help)